system privileged mode

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• System Management Mode — (SMM) is an operating mode first released with the Intel 386SL and available in later microprocessors in the x86 architecture, in which all normal execution (including the operating system) is suspended, and special separate software (usually… …   Wikipedia

• privileged mode —    An operating mode supported in protected mode in Intel processors that allows the operating system and certain classes of device drivers to manipulate parts of the system, including memory and input/output ports. Applications cannot be… …   Dictionary of networking

• System call — In computing, a system call is the mechanism used by an application program to request service from the kernel. Background A system call is a request made by any arbitrary program to the kernel for performing tasks picked from a predefined set… …   Wikipedia

• Protected mode — This article is about an x86 processor mode. For Internet Explorer Protected Mode, see Mandatory Integrity Control. x86 processor modes Mode First supported Real mode Intel 8086 8080 emulation mode NEC …   Wikipedia

• Plessey System 250 — The Plessey 250 was a computer system manufactured by the Plessey company. It was successfully deployed by the MOD for the British Army [http://www.army.mod.uk/royalsignals/equipment/digital.html Ptarmigan project] and served in the 1st Gulf War… …   Wikipedia

• Michigan Terminal System — (MTS) The MTS welcome screen as seen through a 3270 terminal emulator. Company / developer University of Michigan and 7 other universities in the US, Canada, and the UK …   Wikipedia

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• Asynchronous System Trap — (AST) refers to a mechanism used in several computer operating systems designed by the former Digital Equipment Corporation (DEC) of Maynard, Massachusetts.Various events within these systems can be optionally signalled back to the user processes …   Wikipedia

• DOS Protected Mode Interface — In computing, the DOS Protected Mode Interface (DPMI) is a specification introduced in 1989 which allows a DOS program to run in protected mode, giving access to many features of the processor not available in real mode. It was initially… …   Wikipedia

• Open (system call) — For most file systems, a program initializes access to a file in a filesystem using the open system call. This allocates resources associated to the file (the file descriptor), and returns a handle that the process will use to refer to that file …   Wikipedia